The present invention limits measurement error and sensor element damage. When a contact-type sensor (200) is placed in close contact with skin (10), a gap (200a) is formed between the skin (10) and a sensor element (214). The contact-type sensor (200) is provided with a water-repellent resin base plate (212) and a water-absorbing sheet (211) that, together with the skin (10) and the sensor element (214), surround the gap (200a).本發明抑制測定誤差及感測器元件的破損。接觸式感測器（200）在接觸至皮膚（10）時，在皮膚（10）與感測器元件（214）之間形成間隙（200a）。接觸式感測器（200）具備與皮膚（10）及感測器元件（214）一同包圍間隙（200a）的斥水性樹脂基板（212）與吸水性片材（211）。
